High-tension rectifier anode



April 12, 1949. PRESSQEL ET AL 2,466,967

- HIGH TENSIQN RECTIFIER ANODE Filed' April 7, 1945 V OTTO PRESSEL & G.A.M. DIEPSTRATEN INVENTOR ATTORNEY.

Patented Apr. 12, 1949 HIGH-TENSION RECTIFIER AN ODE Otto Pressel and Gerardus Adrianus Marinus Diepstraten, Carshalton, England, assignors to The Hartford National Bank and Trust Company, Hartford, Conn., as trustees Application April 7, 1945, Serial No. 587,162 In Great Britain February 22, 1944 Section 1, Public Law 690, August 8, 1946. Patent expires February 22, 1964 6 Claims.

This invention relates to anode constructions for high tension electron discharge rectifier devices, and has for its object to provide an anode of simple construction exhibiting a smooth and rounded end.

According to the present invention, the anode construction comprises a tube, a peripheral projection adjacent one end of the tube, a cupshaped ring slidable on said tube and located against the inner side of said projection with its free end extending beyond said projection but terminating before the end of the tube, and a cup-shaped cap member seating against the end of the tube with its open end directed towards and overlapping the free end of the ring, the overlapping portions being secured together. The tube, the ring and the cap may be made of any of the metals employed in electrodes for vacuum electron discharge apparatus. Some or all of the components may be made from the same material, or they may all be different. Thus for example the tube may consist of molybdenum and the ring and cap may both consist either of molybdenum or tantalum, the joint between ring and cap being soldered either with zirconium, nickel or titanium, or with zirconium, nickel molybdenum or titanium, respectively.

The invention will be described in greater detail with reference to the appended drawing the single figure of which is a fragmentary longitudinal section of an anode in accordance with the invention.

The anode in accordance with the invention, comprises a tube I which is cylindrical apart from the peripheral projection 2 which is formed adjacent to but spaced from one end. The other end of the tube I which is not shown, supports the anode in the rectifier device of which the anode forms a part, in well known manner. In the form shown the projection 2 is contemplated as a continuous annular ridge produced by swaging. The cup-shaped ring 3 consists of a cylindrical skirt portion which merges in a smooth curve into the base portion. This base portion is provided with an aperture slightly larger than the external diameter of the tube I so as to be a Sliding fit thereon. The ring 3 is located against the projection 2 with the skirt of the ring extending beyond the projection towards the end of the tube I. The length of the skirt of the ring 3 is so chosen in relation to the distance of the projection 2 from the end of the tube I, that the end of the tube l projects beyond the end of the skirt when the ring 3 is located against the projection. Positioned against the end of the tube I is a cup-shaped cap member 4, the open end '5 of which overlaps with and closely embraces the end of the skirt of the ring 3. The sides of the cap 4 merge in a smooth curve into the end plate of the cap, and the open end 5 of the sides is tapered or chamfered so as to give a smooth transition from the cap 4 to the ring '3.

The overlapping portions of the cap 4 and the ring 3 are secured together by soldering or welding. The tube I, ring 3 and the cap 4 are preferably made of molybdenum, tantalum, zirconium, iron, steel or nickel. When both the ring 3 and the cap 4 consist of molybdenum, the joint between them may be soldered with zirconium (which may be in powder form), nickel or titanium, whereas if they are both made of tantalum the solder may consist of the same range of materials with the addition of molybdenum. These soldering materials have the advantage that they act as getters. Moreover the solder-ed joint can be produced without the use of flux. If the cap and ring are made of different materials soldering can still be done with a material of a lower melting point than either cap or ring, or the joint can be produced by welding, preferably with H. F. heating, the materials of lower melting point diffusing into the material of higher melting point.

We claim:

1. An anode for a high tension electron discharge rectifier device, comprising a tubular member having a peripheral projection adjacent one end thereof, a cup-shaped ring member encircling said tubular member and having an inner portion thereof located against the inner side of said projection and a rim portion thereof extending beyond said projection and terminating before the said end of the tubular member, and a cup-shaped cap member having an inner portion thereof positioned against the said end of the tubular member and a rim portion thereof extending towards and overlapping the rim portion of said ring member, the said overlapping portions of the ring member and the cap member being secured together.

2. An anode for a high-tension electron discharge rectifier device, comprising a tubular member having an annular peripheral projection adjacent one end thereof, a cup-shaped ring member encirclin said tubular member and having an inner portion thereof located against the inner side of said projection and a rim portion thereof extending beyond said projection and terminating before the said end of the tubular member, and a cup-shaped cap member having an inner portion thereof positioned against the said end of the tubular member and a rim portion thereof extending towards and overlapping the rim portion of said ring member, the said overlapping portions of the ring member and the cap member being secured together.

3. An anode for a high tension electron discharge rectifier device, comprising a tubular member having a peripheral projection adjacent one end thereof, a cup-shaped ring member encircling said tubular member and having an inner portion thereof located against the inner side of said projection and a rim portion thereof extending beyond said projection and terminating before the said end of the tubular member, and a cup-shaped cap member having an inner portion thereof positioned against the said end of the tubular member and a rim portion thereof extending towards and overlapping the rim portion of said ring member, said tubular member, ring member and cap member being made of molybdenum, and said overlapping portions of end thereof, acup-shaped ring member encircling said tubular member and having an inner portion thereof located against the inner side of said projection and arim portion thereof extending beyond said projection and terminating before the said end of the tubular member, and a cup- ,shaped cap member having an inner portion thereof positioned against the said end of the tubular member and a rim portion thereof ex- ,tendingtowards and overlapping the rim portion -Of"$&idl1i11g member, said tubular member, ring memberand cap member beingmade of molybdenum, and said overlapping portions of the ring 4 member and the cap member being soldered together with a material selected from the group consisting of zirconium and titanium.

'5. An anode for a high tension electron discharg rectifier device, comprising a tubular molybdenum member having a peripheral projection adjacent one end thereof, a cup-shaped tantalum ring member encircling said tubular member and having an inner portion thereof located against the inner side of said projection and a rim portion thereof extending beyond said projection and terminating before the said end of the tubular member, and a cup-shaped tantalum cap member having an inner portion thereof positioned against the said end of the tubular member and a rim portion thereof extending towards and overlapping the rim portion of said ring member, the said overlapping portions of the ring member and the cap member being soldered together with a material selected from the group consisting of Zirconium, and titanium.

6. An anode for a high-tension electron discharge rectifier device as claimed in claim 1 wherein the said overlapping portions are soldered together with a material having a lower melting point than the ring memberand the cap member.

OTTO PRESSEL. GERARDUS ADRIANUS MARINUS DIEPSTRATEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,015,065 Pacziga Jan. 16, 1912 1,577,974 Kelly Mar. 23, 1926 2,026,002 Schmidt Dec. 31, 1935 

